ingo@647: package de.intevation.flys.exports;
ingo@647: 
ingo@647: import java.awt.Transparency;
ingo@647: import java.io.IOException;
ingo@647: import java.io.OutputStream;
ingo@647: 
ingo@647: import org.w3c.dom.Document;
ingo@647: 
ingo@647: import org.apache.log4j.Logger;
ingo@647: 
ingo@647: import org.jfree.chart.ChartRenderingInfo;
ingo@647: import org.jfree.chart.JFreeChart;
ingo@647: 
ingo@647: import de.intevation.artifacts.Artifact;
ingo@647: import de.intevation.artifacts.CallContext;
ingo@647: 
ingo@695: import de.intevation.artifactdatabase.state.Facet;
ingo@695: 
ingo@647: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@647: 
ingo@647: 
ingo@647: /**
ingo@647:  * An OutGenerator that generates meta information for charts. A concrete
ingo@647:  * ChartInfoGenerator need to instantiate a concrete ChartGenerator and dispatch
ingo@647:  * the methods to that instance. The only thing this ChartInfoGenerator needs
ingo@647:  * to, is to overrite the generate() method which doesn't write the chart image
ingo@647:  * to the OutputStream but a Document that contains some meta information of the
ingo@647:  * created chart.
ingo@647:  *
ingo@647:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@647:  */
ingo@647: public abstract class ChartInfoGenerator implements OutGenerator {
ingo@647: 
ingo@647:     /** The logger used in this generator.*/
ingo@647:     private static Logger logger =
ingo@647:         Logger.getLogger(ChartInfoGenerator.class);
ingo@647: 
ingo@647: 
ingo@647:     /** The OutGenerator that creates the charts.*/
ingo@653:     protected XYChartGenerator generator;
ingo@647: 
ingo@647:     protected OutputStream out;
ingo@647: 
ingo@647: 
ingo@647: 
ingo@653:     public ChartInfoGenerator(XYChartGenerator generator) {
ingo@647:         this.generator = generator;
ingo@647:     }
ingo@647: 
ingo@647: 
ingo@647:     /**
ingo@647:      * Dispatches the operation to the instantiated generator.
ingo@647:      *
ingo@647:      * @param request
ingo@647:      * @param out
ingo@647:      * @param context
ingo@647:      */
ingo@647:     public void init(Document request, OutputStream out, CallContext context) {
ingo@647:         this.out = out;
ingo@647: 
ingo@647:         generator.init(request, out, context);
ingo@647:     }
ingo@647: 
ingo@647: 
ingo@647:     /**
ingo@647:      * Dispatches the operation to the instantiated generator.
ingo@647:      *
ingo@647:      * @param master
ingo@647:      */
ingo@647:     public void setMasterArtifact(Artifact master) {
ingo@647:         generator.setMasterArtifact(master);
ingo@647:     }
ingo@647: 
ingo@647: 
ingo@647:     /**
ingo@647:      * Dispatches the operation to the instantiated generator.
ingo@647:      *
ingo@647:      * @param artifacts
ingo@647:      * @param facet
ingo@647:      * @param attr
ingo@647:      */
ingo@1684:     public void doOut(
ingo@1684:         Artifact artifact,
ingo@1684:         Facet    facet,
ingo@1684:         Document attr,
ingo@1684:         boolean  visible
ingo@1684:     ) {
ingo@1684:         generator.doOut(artifact, facet, attr, visible);
ingo@647:     }
ingo@647: 
ingo@647: 
ingo@647:     /**
ingo@647:      * This method generates the chart using a concrete ChartGenerator but
ingo@647:      * doesn't write the chart itself to the OutputStream but a Document that
ingo@647:      * contains meta information of the created chart.
ingo@647:      */
ingo@647:     @Override
ingo@647:     public void generate()
ingo@647:     throws IOException
ingo@647:     {
ingo@647:         logger.debug("ChartInfoGenerator.generate");
ingo@647: 
ingo@653:         JFreeChart chart = generator.generateChart();
ingo@647: 
ingo@653:         int[] size = generator.getSize();
ingo@647: 
ingo@647:         ChartRenderingInfo info = new ChartRenderingInfo();
ingo@647: 
ingo@647:         chart.createBufferedImage(size[0], size[1], Transparency.BITMASK, info);
ingo@647: 
ingo@673:         InfoGeneratorHelper helper = new InfoGeneratorHelper(generator);
ingo@673:         Document doc = helper.createInfoDocument(chart, info);
ingo@647: 
ingo@647:         XMLUtils.toStream(doc, out);
ingo@647:     }
ingo@647: }
ingo@647: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :